Outer Cap
In modern high-voltage electrical protection architectures, the outer cap serves as the critical terminal contact connecting the high-voltage DC fuse to the power electronics module. Our fuse copper caps are manufactured from high-purity T2 copper using a multi-stage progressive deep-drawing and high-precision stamping process. By optimizing the metal's microcrystalline structure and precisely controlling wall thickness during the seamless drawing process, we ensure excellent mechanical yield strength and resistance to arc-induced pressure surges, all while maintaining superior electrical conductivity.
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Product Introduction
What is an outer cap?
The outer end cap is a precision conductive component designed for the terminals of high-voltage fuses and power electronic devices. It is manufactured from high-purity T2 copper using precision deep-drawing and electroplating processes. Under normal operating conditions, it leverages the copper's high conductivity and low contact resistance to transmit high currents with minimal loss while facilitating heat dissipation. In the event of a short circuit, it functions as the end cap of a sealed pressure vessel, withstanding the instantaneous expansion pressure generated by the high-temperature internal arc to ensure safe arc extinction and prevent the fuse from bursting.
Key Features of Copper Slip Cap Fitting
High Conductivity
The round, polished copper End Cap can reduce Joule heat and terminal temp rise to enable high-current, low-loss power transfer.
High Thermal Conductivity
The end plate features an excellent thermal conductivity coefficient, allowing for the rapid absorption and dissipation of internally accumulated heat.
Superior Corrosion Resistance
The copper end plate resists oxidation and peeling under salt spray, heat, and corrosive gases for reliable long-term contact.
High Deep-Drawability
Withstands multi-station deep drawing without cracking, ensuring highly uniform wall thickness.
Exceptional Mechanical Toughness
The outer end cap absorbs energy through slight deformation when subjected to high-pressure electric arc impacts; acts as an explosion-proof pressure vessel to completely prevent tube rupture.
Excellent Plating Adhesion
Copper cap fitting compatible with tin, silver, and nickel plating processes; offers strong molecular-level bonding to ensure the coating does not peel or flake off during high-temperature thermal cycling.
Good Weldability
Copper outer cap for industrial power fuse forms a robust, low-resistance metallurgical bond with the internal fuse element; perfectly suited for spot welding and laser welding, completely eliminating the risk of cold joints.
High Stress & Cold Resistance
The copper pressure tube cap fitting maintains stability across a wide temperature range, keeping the ceramic tube's interference fit secure under extreme cold or vibration.
Although small in size, the round polished copper end cap embodies both high-precision stamping and complex control of microscopic features. Leveraging fully automated production lines, we achieve efficient, precision manufacturing, transforming raw coil stock into finished products.
Rigorous Incoming Material Inspection
100% inspection of every batch of copper material using spectrometers and hardness testers to verify chemical composition, hardness, and thickness tolerances.
Multi-Stage Progressive Deep Drawing
High-speed presses utilize multi-stage progressive drawing to precisely form copper strips into copper end caps Round with specific wall thicknesses.
Precision Punching and Trimming
Accurate punching of the cap top and sides, followed by thorough deburring using rotary trimming dies.
Ultrasonic Degreasing and Cleaning
Multi-stage ultrasonic cleaning completely removes drawing oils, ensuring zero residue for optimal plating adhesion.
Continuous Electroplating and Annealing
Uniform electroplating combined with stress-relief annealing to completely eliminate internal stresses generated during the stamping process.
Fully Automated CCD Optical Sorting
Vision systems inspect dimensions and concentricity at millisecond speeds, automatically rejecting defective parts such as those with scratches or deformation.
Applications of Metal End Cap
Electric Vehicle (EV/HEV) Fuses
Traction battery main circuit fuses, PDU/BDU protection fuses, and high-voltage DC fuses for fast-charging stations.
Energy Storage Systems
Round polished copper end-cap DC fuses for containerized energy storage battery clusters and protection end-caps for PCS inverters.
Power Electronics and Rail Transit
End plate protection components for grid-tied PV inverters, wind power converters, and rail transit traction converters.
High-Voltage Industrial Protection
Copper pressure tube cap fitting high-voltage current-limiting fuses, and protection end caps for power transformers.
Frequently Asked Questions About Matte Tin-plated Copper Cap
end caps for copper pipe?
Pure copper offers significantly higher electrical conductivity than brass. Pure copper end caps effectively minimize contact temperature rise and power loss, making them ideal for high-current and high-frequency protection applications. In contrast, while brass is harder, its conductivity is lower; it is typically reserved for low-current applications or standard low-voltage scenarios with less stringent temperature rise requirements.
We utilize multi-station progressive dies, distributing the total deformation across 5 to 8 incremental stages to effectively prevent metal thinning and stress concentration often caused by single-stage drawing. Additionally, we incorporate micron-level compensation designs within the tooling and employ in-line CCD optical monitoring to guarantee consistent tolerances for inner diameters and wall thicknesses across every batch.
Yes, we do. We possess comprehensive in-house mold design and manufacturing capabilities. Simply provide 3D models (STEP/IGES) or 2D engineering drawings, and our engineering team will assess the feasibility of the drawing process, design the production layout, and facilitate rapid sample development.
All plated copper caps for cylindrical fuses undergo a specialized anti-tarnish passivation treatment. Before shipment, products are vacuum-sealed to remove oxygen and include desiccants and moisture-proof barriers. This ensures that the round copper caps retain excellent solderability and surface luster even after being stored in overseas warehouses for over 12 months.
Contact Us
Leveraging our mature progressive die technology and 100% inspection capabilities, we custom-manufacture outer caps that meet rigorous standards, helping you accelerate global market entry and scale up production. Submit your specifications to receive a tailored solution, along with engineering samples and a price quote.
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